List of top Chemistry Questions

The element which forms oxides in all oxidation states $+1$ to $+5$ is

The dipole moment is the highest for

The crystal system of a compound with unit cell dimensions $a = 0.387\, nm$, $b = 0.387\, nm$ and $c = 0.504 \,nm$ and $\alpha = \beta = 90^{\circ}$ and $\gamma$ = $120^{\circ}$ is

The correct order of bond angles (smallest first) in $H_2S, NH_3, BF_3$ and $SiH_4$ is

The conjugate base of $H_2PO_4^ -$ is

The compound formed on heating chlorobenzene with chloral in the presence concentrated sulphuric acid is

The compound having only primary hydrogen atoms is

The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

The $ BC{{l}_{3}} $ is a planar molecule whereas $ NC{{l}_{3}} $ is pyramidal, because:

The average osmotic pressure of human blood is $7.8$ bar at $37^{\circ}\, C$. What is the concentration of an aqueous $NaCl$ solution that could be used in the blood stream?

Which of the following give ammonia, on heating with NaOH?

Thomas slag is:

Which of the following Statements, about zero order reaction is not true?

The amount of $ {{\text{H}}_{\text{2}}}\text{S}\text{.} $ required to precipitate $ \text{1}\text{.69 g BaS} $ from $ \text{BaC}{{\text{l}}_{\text{2}}} $ solution is:

Representative elements are

The molecule of $CO _{2}$ has angle $180^{\circ}$. It can be explained on the basis of :

''The addition of unsymmetrical reagents to unsymmetrical alkenes occurs in such a way that the negative part of the addendum goes to that carbon atom of the double bond which carries lesser number of hydrogen atoms'' is called by :

Bessemer converter is used for the preparation of:

$Mg$ and $Li$ are similar in their properties due to:

Which of the following oxides of nitrogen is solid?

One mole of magnesium nitride on the reaction with excess of water gives

Number of lone pair(s') in $XeOF_4$ is/are

Calculate $\Delta G^{o}$ for conversion of oxygen? To ozone $3 / 2 O _{2}(g) \rightarrow O _{3}(g)$ at $298 \,K$, if $K_{p}$ for this conversion is $2.47 \times 10^{-29}$ :

The structural formula of indigo dye is :

Lattice energy is calculated by :